Joegen geobg maaedt



f 106. COMPoslTloNs,

COMING on PLASTIC.

Ugrss Referen I (No Model.)

JjGJ MAARDT. covBRINQ PoR STEAM BOILERS, aw. I

V`Patented June 3 0, 1885.

UNITED STATES JRGN GEORG MAARDT, OF COPENHAGEN, DENMARK.

COVERING FOR ST'EAM-BOILERS, SoC.

SPECIFICATION forming part of Letters Patent N o. 321,233, dated J une30.1885.

Application led May 1lI 1885. (No model.)

.To all whom it may concern:

Be it known that I, J RGEN GEORG MAARDT, a subject of the King ofDenmark, residing at Copenhagen, in the Kingdom of Denmark, haveinvented a certain new and useful Fire- Proof Composition for CoveringSteam-Boilers, Steam-Pipes, and for similar purposes; and I do declarethe following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same.

My inventionhas relation to that class of protective coatings orcoverings for steamboilers, steam-pipes, heating-pipes, 8mo., which aredesigned to prevent undue radiation of heat from the coated or coveredsurface, while at the same time it forms a protection against rust orcorrosion; and it consists in an improved ire-proof composition, whichis adapted to bemolded into any desired'shape, so as to t theconformation of the surface for which it is intended, substantially aswill be hereinafter more fully described and claimed, reference beinghad to the accompanying drawings,

in which- Y Figure 1 represents a section of the molded packing, adaptedlo lit a steam-pipe, and Fig. 2 is a cross section of a pipe providedwith the packing.

To prepare this composition, I mix a suitable quantityv of sawdustulverized cork ulverized bark-l-s'lEh-f'iE-Fr-o'n-l'Ethi-I ''m--ms branor any light material of a sim a suitable quantity of soluble lasseither silicate of soda, silicami'slfdr a mixture of both, to form asoft mass of a consistency like cream or gruel. To this mixture I nowadd a suitable corporate its several ingredients and form a quantity ofulverized chalk or slaked lime, to form a plastic mass 0l msu Aonsistency th'a't homogeneous plastic mass, whi l1 is'molded,

by any desired method or means, in

adapted to tit the surface of the boiler, steampipe, or other objectupon which it is to be placed. After the material hadtit is re- 5o'moved from the molds, and bol 1n a strong solution ofehlorcalciummnesium 'chlorarmm or any s1m1|ar chemie' am meh will causethe .shaped pieces to set7 or harden. Next the pieces, after thisboiling process, are subjected to a lixiviat-in rocess by submittingthem to amh'avpashinff with boiling water for the purpose o 1ss i if n lrem u ving all the soluble salts with which they have becomeimpregnated. After this washing, the parts are ready to be applied tothe object for which they are intended without further treatment; and ifmade in sections the several sections maybe united by cementing themtogether, or in any other suitable manner.

This composition is not only a perfect noneonductor of heat; but it isabsolutely fireproof, and will not corrode.

Having thus described my invention, I claim 7n and desire to secure byLetters Patent of the vUnited Statesf A compound or composition formaking fireproof covering or coating for steam-boilers, g steam-pipes,and for similar purposes where it is desired -to prevent undue radiationof heat, the same consisting of a mixture of sawdust or similarcomminuted material, solul'ile glass, and chalk or slaked lime, moldedinto sux .a esha-pes, t en ox e 1n a solution of 8o chlorcalcium or itschemical equivalent, and then lixlvlated to remove the soluble salts bytreating or washing with boiling water, substantially as set forth.

In testimony whereof I have hereto affixed t my signature'iu presence oftwo witnesses. UORGEN GEORG MAARDT. Witnesses:

J ULrUs FREDERLK SELLEnUss,

VYzo CARL PRoscH.

